See why a tempting answer is wrong.
Common wrong answer: The day is ending because the gate is still swinging and everything is moving in the wind.
Why students choose it: students notice the swinging gate first because it is vivid and appears in the opening line. So it feels like an important clue.
Why it is incomplete: The gate shows movement, but it does not show time passing. Use 'At dusk' and the lights coming on as proof. The last bus and the shop blind add more clues.
Corrected reading: The day is ending because light, transport, shops, voices and the clock all show the street closing down. The swinging gate is only a movement detail.